It will be nice to see the R5s come out in a R5 style body (without embedded bottom grip). That will give us all a choice of a smaller camera vs a larger bottom gripped (R3) camera. Many have strong preferences for one or the other, so having both is a brilliant strategy.
I'll be one that will (probably) prefer the smaller R5s style body, but I'll have to wait and see what both have to offer before knowing for sure which I'll hope to get as a 2nd body. Until that day, I'll always be glad for how great the R5 has been, and will continue to be.